This is a serious security regression. If you are not able to fix this quickly, please revert the change that introduced it.

If this doesn't affect a release branch, or has not been properly classified for severity, please update the Security_Impact or Security_Severity labels, and remove the ReleaseBlock label. To disable this altogether, apply ReleaseBlock-NA.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Guessing https://chromium.googlesource.com/chromium/src/+/0d68a512e634d31dce7d71a71b4c867bf647ccf1 based on regression range.

ClusterFuzz has detected this issue as fixed in range 493422:493447.

Detailed report: https://clusterfuzz.com/testcase?key=5653440717127680

Fuzzer: inferno_twister_c
Job Type: linux_ubsan_vptr_content_shell_drt
Platform Id: linux

Crash Type: Bad-cast
Crash Address: 0x25a6efc833c8
Crash State:
  Bad-cast to blink::ScriptWrappableblink::DOMDataStore::SetReturnValueFast
  blink::V8Window::namedPropertyGetterCustom
  blink::V8Window::namedPropertyGetterCallback
  
Sanitizer: undefined (UBSAN)

Recommended Security Severity: High

Regressed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_content_shell_drt&range=490847:492300
Fixed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_content_shell_drt&range=493422:493447

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5653440717127680

See https://github.com/google/clusterfuzz-tools for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

ClusterFuzz testcase 5653440717127680 is verified as fixed, so closing issue as verified.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.

This bug has been closed for more than 14 weeks. Removing security view restrictions.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot